Consistent closures for Euler-Lagrange models of bi-disperse gas-particle suspensions derived from particle-resolved direct numerical simulations

Federico Municchi, Stefan Radl

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Particle-Resolved Direct Numerical Simulation (PR-DNS) is employed to simulate momentum and energy transport in bi-disperse gas-solid suspensions by means of a novel hybrid immersed-boundary/fictitious domain (HFD-IB) method. First, we demonstrate the accuracy of the new HFD-IB method against several verification tests. Subsequently, we simulate momentum and energy transfer in bi-disperse suspensions in the limit of high Stokes number, and the predicted flow and temperature fields are used, in conjunction with the open-source parallel data processing library CPPPO (Municchi et al., 2016), to assess the validity of existing closures for momentum and heat transfer in the frame of Particle-Unresolved Euler-Lagrange (PU-EL) models. We propose a correction to the drag force model proposed by Beetstra et al. (2009) which consistently takes into account the pressure contribution to the total fluid-particle interaction force in PU-EL models. Also, we propose a stochastic closure model for the per-particle drag coefficient based on a modified log-normal distribution. Finally, we assess the existence of an analogy between the particle-based drag coefficient and the conditionally-averaged Nusselt number. Indeed, our PR-DNS data indicates that a stochastic closure similar to that for the drag can be used to close the particle-based Nusselt number in dense bidisperse suspensions.
Original languageEnglish
Pages (from-to)171-190
Number of pages20
JournalInternational journal of heat and mass transfer
Volume111
DOIs
Publication statusPublished - 6 Apr 2017

Fingerprint

Direct numerical simulation
direct numerical simulation
closures
Suspensions
Gases
Momentum transfer
Drag coefficient
Nusselt number
gases
Drag
drag coefficients
Particle interactions
Normal distribution
drag
momentum transfer
Energy transfer
solid suspensions
Flow fields
Momentum
Temperature distribution

Keywords

  • Particle-resolved direct numerical simulation
  • Closure models
  • Polydisperse
  • Multiphase flow
  • Heat transfer
  • Gas-particle suspensions

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

Fields of Expertise

  • Advanced Materials Science

Cooperations

  • NAWI Graz

Cite this

Consistent closures for Euler-Lagrange models of bi-disperse gas-particle suspensions derived from particle-resolved direct numerical simulations. / Municchi, Federico; Radl, Stefan.

In: International journal of heat and mass transfer, Vol. 111, 06.04.2017, p. 171-190.

Research output: Contribution to journalArticleResearchpeer-review

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